#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

int main(){
    
	FILE *fp;

	fp = fopen("tmp","r");
	if (fp == NULL){
//	  fprintf(stderr,"fopen() failed! errno = %d\n",errno);
          perror("fopen()");		
	  exit(1);
	}
	puts("OK!");
	exit(0);	

}

